Snapshot UI issues

[typpos]

v0.5.5

1. Tree element focus out of sync with active item

a) Create first snapshot. The tree now does not show a selected row. However, clicking on "Take snapshot" again creates a sub-snapshot. Likewise if you create a third snapshot which becomes the child of the second snapshot.

b) If you open Snapshot Manager with an existing snapshot, then that snapshot is selected. However, the "Go to snapshot" and "Remove snapshot" buttons are disabled. If you click on the already selected item, the buttons become enabled.

c) When creating a child-snapshot, it should probably be selected and name and description fields be updated.

d) after deleting a snapshot, no snapshot is selected, but "Remove" is enabled. Clicking the button and confirming "yes" shows an error. Likewise for "Go to snapshot" and snapshot-details text elements.

e) same as (d) when the last snapshot has been removed.

Design suggestion: Single UpdateUI() method that handles ALL the state/enabled settings and is called by ALL relevant events across all UI elements and form show & activate event.

2. Dead help button

The Snapshot Manager window and the Create-new-snapshot dialog show a "?" help in the title bar, but the button has no clickable targets.

3. Multiple Snapshot Managers

Ability to show concurrent Snapshot Manager windows for different sandboxes might be convenient, but allowing multiple Snapshot Managers for the same sandbox without concurrent updates feels like asking for trouble.